RT Journal Article SR Electronic T1 Primary Sjögren’s syndrome with tuberculous arthritis of left knee JF BMJ Case Reports FD BMJ Publishing Group Ltd SP bcr0720114488 DO 10.1136/bcr.07.2011.4488 VO 2011 A1 Ting Zhang A1 Jia Cong A1 Dong Xu A1 Xiaomei Leng A1 Fengchun Zhang YR 2011 UL http://casereports.bmj.com/content/2011/bcr.07.2011.4488.abstract AB A 56-year-old woman presented with recurrent pain and swelling of left knee, Raynaud’s phenomenon and dry mouth. She was initially diagnosed with primary Sjögren’s syndrome and was put on prednisone, which substantially relieved her complaints. But 8 months later, pain and swelling of left knee recurred with spiking fever, chills and shortness of breath. Escalation of prednisone did not improve the pain and swelling of left knee. CT of chest revealed pulmonary interstitial changes with coexisting infection. MRI of left knee was highly consistent with tuberculous arthritis, which was further confirmed by positive blood culture of Mycobacterium tuberculosis and acid-fast stain of synovial fluid.